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Old 4th September 2014, 10:16 AM   #661
kees52 is offline kees52  Netherlands
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I have seen that the sheet for exel I did download do calculate a lot of possibilities of what is possible. Also it is said that flux density is important for how much I can get out, the laminels of my trafo are 0.5 mm thick and for welding I have read it is possible to use higher flux.

See picture of the calculations.

regards

kees
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Last edited by kees52; 4th September 2014 at 10:20 AM.
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Old 4th September 2014, 10:28 AM   #662
AJT is offline AJT  Philippines
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0.5mm can also mean lower quality...be cautious running high flux...
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Old 4th September 2014, 10:45 AM   #663
kees52 is offline kees52  Netherlands
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I have use 1.2 T I think this is oke, the trafo was a 1500 VA 220 v to 110 v of origine.
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Old 4th September 2014, 10:48 AM   #664
AJT is offline AJT  Philippines
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how hot was it running then?
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Old 4th September 2014, 10:54 AM   #665
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by AJT View Post
how hot was it running then?
If I did now I tell, I Have it from a scrapyard of how it is called in english.

I think I go for a inverter, I have the core,s, only I need a constant voltage source for Co2 welding with wire, I presume a smps with voltage feeback and current protection (above 130 amp it get in) is the way to go. electronics and pcb is no problem, however what chinese supplyer is to be trusted when order on ebay the IGBT,s and diodes.

I did see with current source inverter that only current is regulated and no voltage feedback make it open.

regards

kees
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Old 4th September 2014, 10:59 AM   #666
AJT is offline AJT  Philippines
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okey, i suggest that you extend your primary winding, if you are running 230 volts, make a winding that can run 260 volts...several taps so you can reduce current if needed...
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Old 4th September 2014, 12:44 PM   #667
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by kees52 View Post
André

Not agree with this, read this paper.

Constant Current vs. Constant Voltage Output

Stick welding needs constant current source and MIG (wire feed) needs constant voltage (because of automatic feed of wire).

And so what to do with a inverter, have i build a normally power source with voltage feedback aca normal power supply and current protection.

The open voltage of my own MIG welder is 32 volts on max amps and has to be a voltage source the big coil in series with trafo act as the restistor to get this done.............
Thanks for the link.
I see I have CC type welders for stick (oil cooled) and for TIG (air cooled).
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Old 4th September 2014, 12:47 PM   #668
kees52 is offline kees52  Netherlands
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Thanks for the link.
I see I have CC type welders for stick (oil cooled) and for TIG (air cooled).
yes onlt stick and tig, mig needs voltage source, wire is the current regulation factor (speed and volts) some has even a wire feed who speed control also affect the output voltage (professional stuff)..

I my case a choke in series with trafo do the trick.

regards

kees
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Old 4th September 2014, 03:04 PM   #669
kees52 is offline kees52  Netherlands
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I have calculate the trafo such that I have 140 amps on 21.2 volts like the welder has on manual, now it looks it fit and wire thickness etc is more normal.

I have use a flux of 1.35 T what is used for weld transformers.

program calculates load on output, so I think if i build the thing I get 32 volts open loop.

regards

kees
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Old 5th September 2014, 03:54 AM   #670
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try a flux density of 1.7T and you'll have much more reasonable results.

most stick welders have 80 volts open circuit.
With either adjustable magnetic shunts for current control or an inductor with multiple taps.

Last edited by johansen; 5th September 2014 at 04:06 AM.
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